Add information about matrix-params in the artifacts.properties reference (#1487)
Add information about matrix-params in the artifacts.properties reference (#1487)

* add matrix-params to docs

* finally landed in 7.3.2

* Update reference/config_files/artifacts.properties.rst

Co-Authored-By: Carlos Zoido <2accafae6a9d696f958aa2dba27077cd7a20a336@gmail.com>

Co-authored-by: Carlos Zoido <2accafae6a9d696f958aa2dba27077cd7a20a336@gmail.com>
conan-io/docs,conan-io/docs,conan-io/docs,conan-io/docs